Original story: Blizzard has officially opened up the StarCraft II beta opt-in, according to a new post on the World of Warcraft site.
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"The StarCraft II beta-test period is coming in the months ahead! If you'd like a chance to participate, now's the time to let us know," reads the post.

Interested parties must simply visit their Battle.net profile page, choose to opt-in for the beta, and re-submit their current system specs by way of a small downloadable piece of software.

Blizzard's SC2 beta FAQ explains that the North American beta test will begin first.